28288787 has 8 divisors (see below), whose sum is σ = 28751760. Its totient is φ = 27829600.

The previous prime is 28288769. The next prime is 28288823. The reversal of 28288787 is 78788282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28288787 - 2⁸ = 28288531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28288747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16664 + ... + 18282.

It is an arithmetic number, because the mean of its divisors is an integer number (3593970).

Almost surely, 2^28288787 is an apocalyptic number.

28288787 is a deficient number, since it is larger than the sum of its proper divisors (462973).

28288787 is a wasteful number, since it uses less digits than its factorization.

28288787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

The product of its digits is 802816, while the sum is 50.

The square root of 28288787 is about 5318.7204288250. The cubic root of 28288787 is about 304.6992897494.

The spelling of 28288787 in words is "twenty-eight million, two hundred eighty-eight thousand, seven hundred eighty-seven".